The practical importance of phase separation for the optical and mechanical properties of many glass forming systems is well established. In the present contribution glasses within the immiscibility region of the sodium borosilicate system as well as samples to which 0.5 and 1 Mol% dopant ions (Eu3+ and P5+) have been added, were prepared under normal conditions. The separation process is monitored by UV-Vis transmittance and luminescence spectroscopy. The spectra are recorded after different intervals of heat-treatment in air. From the transmittance spectra chromaticity coordinates are obtained and the effect of heat treatment is depicted in chromaticity diagrams. From the luminescence spectra of the Eu3+ doped samples asymmetry ratios are obtained.

The practical importance of phase separation for the optical and mechanical properties of many glass forming systems is well established. In the present contribution glasses within the immiscibility region of the sodium borosilicate system as well as samples to which 0.5 and 1 Mol% dopant ions (Eu3+ and P5+) have been added, were prepared under normal conditions. The separation process is monitored by UV-Vis transmittance and luminescence spectroscopy. The spectra are recorded after different intervals of heat-treatment in air. From the transmittance spectra chromaticity coordinates are obtained and the effect of heat treatment is depicted in chromaticity diagrams. From the luminescence spectra of the Eu3+ doped samples asymmetry ratios are obtained.